src/bsv/actual_pinmux.py

   1 from string import digits
   2 try:
   3     from string import maketrans
   4 except ImportError:
   5     maketrans = str.maketrans
   6
   7
   8 # ============== common bsv templates ============ #
   9 # first argument is the io-cell number being assigned.
  10 # second argument is the mux value.
  11 # Third argument is the signal from the pinmap file
  12 mux_wire = '''
  13       rule assign_{2}_on_cell{0}(wrcell{0}_mux=={1});
  14         {2}<=cell{0}_mux_in;
  15       endrule
  16 '''
  17 dedicated_wire = '''
  18       rule assign_{1}_on_cell{0};
  19         {1}<=cell{0}_mux_in;
  20       endrule
  21 '''
  22 # ============================================================
  23 digits = maketrans('0123456789', ' ' * 10)  # delete space later
  24
  25
  26 def cn(idx): # idx is an integer
  27     return "cell%s_mux" % str(idx)
  28
  29
  30 def transfn(temp):
  31     """ removes the number from the string of signal name.
  32     """
  33     temp = temp.split('_')
  34     if len(temp) == 2:
  35         temp[0] = temp[0].translate(digits)
  36         temp[0] = temp[0] .replace(' ', '')
  37     return '_'.join(temp)
  38
  39
  40 def init(p, ifaces):
  41     """ generates the actual output pinmux for each io-cell.  blank lines
  42         need to output "0" to the iopad, if there is no entry in
  43         that column.
  44     """
  45     p.pinmux = ' '
  46     global dedicated_wire
  47     for cell in p.muxed_cells:
  48         p.pinmux += "      // output muxer for cell idx %d\n" % cell[0]
  49         p.pinmux += "      %s_out=" % cn(cell[0])
  50         for i in range(0, len(cell) - 2):
  51             p.pinmux += "wr%s" % cn(cell[0]) + \
  52                 "==" + str(i) + "?" + cell[i + 1] + "_io:\n\t\t\t"
  53         p.pinmux += cell[i + 2] + "_io"
  54         p.pinmux += ";\n"
  55         # ======================================================== #
  56
  57         # check each cell if "peripheral input/inout" then assign its wire
  58         # Here we check the direction of each signal in the dictionary.
  59         # We choose to keep the dictionary within the code and not user-input
  60         # since the interfaces are always standard and cannot change from
  61         # user-to-user. Plus this also reduces human-error as well :)
  62         for i in range(0, len(cell) - 1):
  63             cname = cell[i + 1]
  64             temp = transfn(cname)
  65             x = ifaces.getifacetype(temp)
  66             #print (cname, temp, x)
  67             assert x is not None, "ERROR: The signal : " + \
  68                 str(cname) + \
  69                 " of pinmap.txt isn't present \nin the current" + \
  70                 " dictionary. Update dictionary or fix-typo."
  71             if x == "input":
  72                 p.pinmux += \
  73                     mux_wire.format(cell[0], i, "wr" + cname) + "\n"
  74             elif x == "inout":
  75                 p.pinmux += \
  76                     mux_wire.format(cell[0], i, "wr" + cname +
  77                                                 "_in") + "\n"
  78     # ============================================================ #
  79
  80     # ==================  Logic for dedicated pins ========= #
  81     for cell in p.dedicated_cells:
  82         p.pinmux += "      %s_out=%s_io;\n" % (cn(cell[0]), cell[1])
  83         temp = cell[1].translate(digits)
  84         x = ifaces.getifacetype(temp)
  85         if x == "input":
  86             pinmux = pinmux + \
  87                 dedicated_wire.format(cell[0], "wr" + cell[1]) + "\n"
  88         elif x == "inout":
  89             pinmux = pinmux + \
  90                 dedicated_wire.format(cell[0], "wr" + cell[1] + "_in") + "\n"
  91     # =======================================================#